CLRSELDO
SETPORT(SSTAT0, CLRSELDO);
ahd_outb(ahd, CLRSINT0, CLRSELDO);
ahd_outb(ahd, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO
ahc_outb(ahc, CLRSINT0, CLRSELDO|CLRSELDI|CLRSELINGO);